import sys
input=lambda: sys.stdin.readline().rstrip()
n=int(input())
Y=[int(i) for i in input().split()]
DP=[[0]*(10**4+1) for _ in range(n+1)]
for i,y in enumerate(Y):
  m=DP[i][0]
  for j in range(10**4+1):
    if i==0:
      DP[i+1][j]=abs(j-y)
    else:
      if j==0:
        DP[i+1][j]=DP[i][0]+y
      else:
        m=min(DP[i][j],m)
        DP[i+1][j]=m+abs(j-y)
print(min(DP[n]))